Patents Represented by Attorney David W. Anderson

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  • Redeployable high temperature oil boom
    Patent number: 4802791
    Abstract: A redeployable, high temperature oil containment boom which allows for the in-situ burning of spilled or leaked oil during offshore oil spill cleanup operations is disclosed. The boom can be used for precautionary fire containment during non-burn oil spill cleanups and can be easily recovered and redeployed.
    Type: Grant
    Filed: October 1, 1987
    Date of Patent: February 7, 1989
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Edward M. Fisher, Stephen M. Sanocki
  • Abrasive disc support
    Patent number: 4798025
    Abstract: A support for an abrasive disc which includes a flat base, an upstanding annular rim and preferably four retainers mounted to the base within the rim and biased toward the rim to grip and retain the disc. The disc may be released by depressing cables connecting opposed diametrical pairs of retainers to withdraw the retainers.
    Type: Grant
    Filed: June 29, 1987
    Date of Patent: January 17, 1989
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Roger C. Lokken, John B. Young
  • High temperature oil containment boom
    Patent number: 4781493
    Abstract: A high temperature oil containment boom which allows for the in-situ burning of spilled or leaked oil during offshore oil spill cleanup operations is disclosed. The boom can be used for precautionary fire containment during non-burn oil spill cleanups and can be easily recovered and redeployed.
    Type: Grant
    Filed: August 25, 1986
    Date of Patent: November 1, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Edward M. Fischer
  • Smoking articles
    Patent number: 4776355
    Abstract: Smoking articles, such as cigarettes and little cigars, having self-extinguishing properties when laid on a flat surface yet will not extinguish when held in the hand or placed in an ashtray, are disclosed. The tobacco filler composition of the smoking articles is modified by the addition thereto of a moisture stable alkali metal silicate, the preferred moisture stable alkali metal silicate being borate stabilized sodium silicate.
    Type: Grant
    Filed: June 24, 1986
    Date of Patent: October 11, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: William W. Stevenson, Joseph Graham
  • Drive-out assembly for microfilm apparatus
    Patent number: 4765561
    Abstract: A drive-out assembly to thread a film wound on a reel or in a coil 2 includes an arm 7 to swing into the cartridge and engage the film with a drive-out roller 8 which drives the film in an unwinding direction to drive the free end over a stripper member 10 urged against the film. The drive for the drive-out roller 8 includes a first drive gear 20 which rotates a driven gear 23 through an intermediate gear 21 to drive a shaft 19 having a drive gear 23 to drive the drive-out roller 8 through other intermediate gears 24, 8'.
    Type: Grant
    Filed: April 28, 1987
    Date of Patent: August 23, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Wolfgang Kaps
  • Apparatus for feeding the free end of a microfilm to a takeup reel and for winding the microfilm thereon
    Patent number: 4759511
    Abstract: An automatic film takeup reel to capture the free end of a film and wind the end, must guide the film along a feed passage formed by a housing toward a rotating reel of a soft material. The end of the film is held to the reel by a ball biased by a spring toward the reel and is directed around a cavity until wound. A spring biased arm then shifts the housing axially of the reel to afford continued winding.
    Type: Grant
    Filed: April 28, 1987
    Date of Patent: July 26, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Friedhelm Kuhlmann, Heinz G. Mobius
  • Second harmonic generation with 5-chloro-2-nitroaniline
    Patent number: 4756598
    Abstract: Devices for and method of generating coherent second harmonic light radiation. The devices comprise a laser source of coherent light radiation at a fixed fundamental frequency, crystalline 5-chloro-2-nitroaniline that crystallizes in a non-centrosymmetric configuration, means for directing the output radiation of the laser onto the 5-chloro-2-nitroanilane, and output means for utilizing the second harmonic frequency.
    Type: Grant
    Filed: August 13, 1987
    Date of Patent: July 12, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Diana J. Gerbi, Peter C. Leung, John J. Stofko, Jr.
  • Tape cartridge drive with tape biasing arm to allow head movement normal to tape path
    Patent number: 4755900
    Abstract: A data cartridge which is edge loaded must be loaded before the access door is opened, permitting the head to enter the cartridge but entry and opening of the door can be accomplished when the head is moved vertically from a first lowered position to an upper operative position against the tape and to permit movement of the head to the upper operative position, the tape must be temporarily moved from its path in the cartridge to permit vertical movement of the magnetic head without contacting the tape. The present invention permits tape movement and head positioning upon operation of a cam shaft with a front knob.
    Type: Grant
    Filed: July 7, 1986
    Date of Patent: July 5, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Myron Zarr
  • Static inhibiting bars for videotape cassette
    Patent number: 4754357
    Abstract: The front-facing planar surfaces of a videotape cassette is provided with a series of parallel triangular or semi-elliptical ribs spaced from each other a maximum distance of about 4 mm so that an air barrier is produced between the tape and the ribs and the tape is thus prevented from contacting the planar surface or the ribs when the tape is in motion past the ribs.
    Type: Grant
    Filed: February 4, 1985
    Date of Patent: June 28, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Norman E. Nelson
  • Videocassette tape spool having a wear button
    Patent number: 4752046
    Abstract: A tape spool provides resistance to disassembly from shocks caused by rough handling by providing an annular hub projection extending axially of the spool hub to define a shoulder which interacts with an inner radial wall of a disk providing the second flange of the spool. The inner radial wall of the disk defines a central hole surrounding the hub projection, with contact between the radial wall of the disk and the shoulder of the hub restricting radial movement of the disk with respect to the hub. The disk and the hub also may include intermeshing splines which prevent relative rotation of the disk and the hub.
    Type: Grant
    Filed: June 10, 1986
    Date of Patent: June 21, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: James J. Wulfing
  • Head positioning mechanism for data cartridge recorder
    Patent number: 4750067
    Abstract: A head positioning add mechanism for a multitrack data cartridge recorder including a stepper motor, a lead screw driven by the stepper motor and a head mounting slide engaged with the lead screw by a partial female thread for incrementally moving a recording/playback head transverse to the path of a magnetic recording tape to enable accurate positioning of the head at any given track across the tape.
    Type: Grant
    Filed: July 12, 1985
    Date of Patent: June 7, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Sten R. Gerfast
  • Game monitoring device
    Patent number: 4748601
    Abstract: A game monitoring device includes a digital clock module which is controlled by a trip-thread which is pulled by the passage of game and results in the electrical contact of two leads which control the electronics of the digital clock module.
    Type: Grant
    Filed: December 19, 1986
    Date of Patent: May 31, 1988
    Inventors: Dean K. Reidt, Daryl R. Breitung
  • Cartridge door-latching mechanism
    Patent number: 4744530
    Abstract: Door-latching mechanism for a molded plastic cartridge includes a plastic arm projecting from a wall of the cartridge and acting as a cantilevered spring. At the free end of the arm are a door-locking pawl which locks the door when the spring is at rest and unlocks the door when the spring is flexed. When the cartridge is a VHS or Betamax videocassette, upon inserting it into a recorder, a finger of the recorder depresses the arm and with it the door-locking pawl, thus unlocking the pawl and allowing the door to be opened. The arm may either be integral with the cartridge or molded as a separate plastic piece to be attached to the cartridge.
    Type: Grant
    Filed: September 12, 1986
    Date of Patent: May 17, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Claude E. Cybulski, Gregory H. Johnson
  • Telephoto lens assembly for overhead projector
    Patent number: 4744641
    Abstract: The invention consists of a four-element telephoto projection lens for use in conventional overhead projectors, which lens assembly affords an extended projection distance from the lens to the projection screen while retaining the same back focus as conventional two-element projection lenses for overhead projectors.
    Type: Grant
    Filed: June 1, 1987
    Date of Patent: May 17, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Dennis Vanderwerf
  • Preformed silver halides for photothermographic system
    Patent number: 4743534
    Abstract: Method for preparing photosensitive silver halide crystals. A binder resin, a source of halide ions, and a source of silver ions are dissolved in an organic solvent, e.g., ethanol. Silver halide nuclei will then form. Additional source of halide ions and additional source of silver ions can be added to the solution in incremental additions, so that the initially-formed silver halide nuclei will grow. Upon removal of the solvent, the silver halide crystals will exist in a dry state, entrapped in the binder resin. Silver halide crystals formed and grown in this manner can be used to prepare photothermographic imaging compositions, which compositions will exhibit higher speed than photothermographic imaging compositions containing silver halide crystals grown according to conventional methods.
    Type: Grant
    Filed: November 8, 1985
    Date of Patent: May 10, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Oanh V. Pham
  • Reduced height transmissive overhead projector
    Patent number: 4741613
    Abstract: A transmissive overhead projector includes a Fresnel lens assembly which has an f-number of about 0.25 and is capable of dioptrically focusing light at an incident angle of at least 60.degree. with respect to a perpendicular to the Fresnel lens assembly. This refractive power of the Fresnel lens assembly allows the overhead projector light source to be positioned very close to the Fresnel lens assembly and consequently allows a significant reduction in the base height of the overhead projector.
    Type: Grant
    Filed: December 19, 1986
    Date of Patent: May 3, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Dennis F. Vanderwerf
  • Canister and light sealing, anti-blooming tab
    Patent number: 4732271
    Abstract: A light-tight, self-contained canister and light sealing, anti-blooming tab, of generally rectangular shape, for preventing a roll of core wound photosensitive media, containable within the canister and used in a microfiche or microfilm reader-printer, from being damaged or exposed to actinic light during shipping and storage. The canister includes an open-ended, opaque tubular sleeve having an exit slot, and the sleeve is closed at both ends by opaque end caps fastened thereto. The tab includes an insertable portion joined along a fold line to an extendable portion. The insertable portion may be inserted into the exit slot and engageably wedged between the roll of core wound photosensitive media and the sleeve to prevent undesired rotation. In addition, the extendable portion of the tab is folded at the fold line along the exit slot.
    Type: Grant
    Filed: December 20, 1985
    Date of Patent: March 22, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Alan J. Solyntjes
  • Drive assembly for microfilm cartridges
    Patent number: 4732342
    Abstract: A drive assembly for reels of microfilm provided in a cartridge and placed in a cartridge receiving channel in a direction normal to the axis of the reel supporting the coil of microfilm and usuable with cartridges having differently designed reels comprises a main drive shaft which can be coupled direct to the reel with a backup wheel or coupled to a drive head that is connected in driving engagement with the reel. Automatic locking means and spring biased drive parts afford a drive that is adaptable to the cartridge reel. Releasable drive means withdraw the drive shaft and drive head from the cartridge receiving channel.
    Type: Grant
    Filed: April 28, 1987
    Date of Patent: March 22, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Heinz G. Mobius
  • Tie bar
    Patent number: D294591
    Type: Grant
    Filed: May 13, 1985
    Date of Patent: March 8, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: James R. Espy
  • Tie bar
    Patent number: D294592
    Type: Grant
    Filed: July 24, 1985
    Date of Patent: March 8, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: James R. Espy